InputTextMultiline: fixed an issue calculating lines count when inactive, no word-wrap, and ending with a \n.

Amend 1e52e7b90c (#3237, #952, #1062, #7363)

docs/CHANGELOG.txt

@@ -89,6 +89,9 @@ Other Changes:
     would be incorrect during the deactivation frame. (#9298)
   - Fixed a crash introduced in 1.92.6 when handling ImGuiInputTextFlags_CallbackResize
     in certain situations. (#9174)
+  - InputTextMultiline: fixed an issue introduced in 1.92.3 where line count calculated
+    for vertical scrollbar range would be +1 when the widget is inactive, word-wrap is
+    disabled and the text buffer ends with '\n'.
 - Style:
   - Border sizes are now scaled (and rounded) by ScaleAllSizes().
   - When using large values with ScallAllSizes(), the following items thickness

imgui.h

@@ -30,7 +30,7 @@
 // Library Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM >= 12345')
 #define IMGUI_VERSION       "1.92.7 WIP"
-#define IMGUI_VERSION_NUM   19265
+#define IMGUI_VERSION_NUM   19266
 #define IMGUI_HAS_TABLE             // Added BeginTable() - from IMGUI_VERSION_NUM >= 18000
 #define IMGUI_HAS_TEXTURES          // Added ImGuiBackendFlags_RendererHasTextures - from IMGUI_VERSION_NUM >= 19198
 

imgui_widgets.cpp

@@ -4588,6 +4588,7 @@ static int InputTextLineIndexBuild(ImGuiInputTextFlags flags, ImGuiTextIndex* li
     ImGuiContext& g = *GImGui;
     int size = 0;
     const char* s;
+    bool trailing_line_already_counted = false;
     if (flags & ImGuiInputTextFlags_WordWrap)
     {
         for (s = buf; s < buf_end; s = (*s == '\n') ? s + 1 : s)
@@ -4608,6 +4609,7 @@ static int InputTextLineIndexBuild(ImGuiInputTextFlags flags, ImGuiTextIndex* li
     }
     else
     {
+        // Inactive path: we don't know buf_end ahead of time.
         const char* s_eol;
         for (s = buf; ; s = s_eol + 1)
         {
@@ -4616,6 +4618,7 @@ static int InputTextLineIndexBuild(ImGuiInputTextFlags flags, ImGuiTextIndex* li
             if ((s_eol = strchr(s, '\n')) != NULL)
                 continue;
             s += strlen(s);
+            trailing_line_already_counted = true;
             break;
         }
     }
@@ -4626,7 +4629,7 @@ static int InputTextLineIndexBuild(ImGuiInputTextFlags flags, ImGuiTextIndex* li
         line_index->Offsets.push_back(0);
         size++;
     }
-    if (buf_end > buf && buf_end[-1] == '\n' && size <= max_output_buffer_size)
+    if (buf_end > buf && buf_end[-1] == '\n' && size <= max_output_buffer_size && !trailing_line_already_counted)
     {
         line_index->Offsets.push_back((int)(buf_end - buf));
         size++;